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The average age of 12 students is 20 years. If the age of one more student is included, the average decreased by 1. What is the age of the new student?

A7 years

B8 years

C6 years

D10 years

Answer:

A. 7 years

Read Explanation:

Total age of 12 students = 12 x 20 = 240 Total age of 13 students = 13 x 19 = 247 Age of the new students = 247 - 240 = 7


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